In this June 27, 2017 file photo, the proprietor of a medical marijuana dispensary prepares his monthly tax payment, over $40,000 in cash, at his Los Angeles store. A proposal in Congress to ease the federal ban on marijuana could encourage more banks to do business with cannabis companies, but it appears to fall short of a cure-all for an industry that must operate mainly as a cash business in a credit card world. (AP Photo/Jae C. Hong, File)